Quick answer
Acne is an inflammatory condition of the hair follicle and oil gland, driven by excess sebum, blocked pores, Cutibacterium acnes bacteria and inflammation, often influenced by hormones. It ranges from comedones (blackheads and whiteheads) to papules, pustules, nodules and cysts. At Obliv near Myeongdong and Jongno, Seoul, a doctor diagnoses the type and severity, rules out look-alikes such as fungal acne and rosacea, and plans topical or oral treatment with in-clinic extraction, peels or laser; most plans need 6–12 weeks to show clear improvement.
Key takeaways
- Acne has four drivers: oil, blocked pores, bacteria and inflammation. Effective plans target more than one of them.
- Small, uniform, itchy bumps on the forehead, chest or back without blackheads may be fungal acne (Malassezia folliculitis), which antibiotics can worsen.
- Adult jawline acne with irregular periods, excess hair or scalp hair thinning can be hormonal; see our article on when to see a gynaecologist as well as a skin clinic.
- Isotretinoin is highly effective for severe acne but is a prescription-only medicine with serious risks, including birth defects; it needs a doctor's supervision and monitoring.
- Treating active acne early is the best way to prevent acne scars and dark marks.
What causes acne and breakouts?
Acne starts inside the hair follicle, the tiny canal that also houses an oil (sebaceous) gland. Four processes work together. The gland produces more sebum, often because it is sensitive to androgen hormones. Skin cells lining the follicle become sticky and block the opening, forming a microcomedone. The oily, low-oxygen environment favours Cutibacterium acnes, a normal skin bacterium, which triggers the immune system. The result is inflammation, which makes spots red, swollen and painful and, if deep enough, damages collagen and leaves scars.
Many factors push this cycle. Genetics play a large role, and acne often runs in families. Hormonal changes around puberty, the menstrual cycle, pregnancy, stopping hormonal contraception and polycystic ovary syndrome (PCOS) can all trigger flares. Some medicines, including corticosteroids, some anti-epileptics and anabolic steroids, cause or worsen acne. Heavy, pore-clogging products, friction from masks or helmets, sweat and humidity also contribute, and there is reasonable evidence that high-glycaemic diets and, for some people, dairy may play a part.
Travel often adds short-term triggers: disrupted sleep, a new climate, different water, and new skincare picked up while shopping. If you have had a sudden flare since arriving in Seoul, our guide to tourist acne treatment in Myeongdong explains how we handle it in a short stay.
Types of acne and where they sit in the skin
Doctors classify acne by the kind of spots you have, how many and how deep they go. Severity guides treatment, so naming the type is the first step of any plan. In the Obliv Skin Architecture view, comedones are mainly a surface (epidermal) problem at the pore opening, while inflamed lesions extend into the dermis, where oil glands sit and where scarring happens.
- Whiteheads (closed comedones) — small skin-coloured bumps where the pore is blocked under a thin layer of skin.
- Blackheads (open comedones) — open pores where the plug darkens on contact with air; not dirt.
- Papules — small, red, tender bumps without a visible head; an early inflamed spot.
- Pustules — inflamed spots with a white or yellow centre of pus.
- Nodules and cysts — large, deep, painful lumps that can last weeks and carry the highest risk of scarring. They need a doctor's care, not home treatment.
- Post-acne marks — red (post-inflammatory erythema) or brown (post-inflammatory hyperpigmentation, PIH) flat marks after a spot heals. These fade with time and treatment and are different from true scars, which change skin texture.
| Option | Best for | How it works | Typical course | Points to know |
|---|---|---|---|---|
| Topicals (retinoid, benzoyl peroxide, azelaic acid) | Comedones, mild to moderate acne | Unblocks pores, reduces bacteria and inflammation | Daily; 6–12 weeks to judge | Dryness at first; retinoids avoided in pregnancy |
| Oral antibiotics or hormonal therapy | Moderate inflammatory or hormonal acne | Reduces inflammation or androgen effect | Usually 3–6 months | Prescribed by a doctor; antibiotics time-limited |
| Isotretinoin | Severe, nodular or scarring acne | Shrinks oil glands | Usually 4–6+ months | Prescription only; strict pregnancy prevention and monitoring |
| Medical extraction and acne care | Comedones and closed bumps | Sterile extraction, calming and drainage | Every 2–4 weeks | Avoids the damage of squeezing at home |
| Laser and toning | Oil, redness and post-acne marks | Light or laser energy calms and evens tone | 3–6 sessions | Settings adjusted for skin type |
| Acne scar treatment/ Rejuran | Scars and texture after acne is controlled | Fractional laser, subcision and repair boosters | 3–5 sessions | Best started when active acne is quiet |
Medical foundations: topicals, tablets and isotretinoin
Most acne is controlled with daily topical treatment. Topical retinoids such as adapalene or tretinoin unblock pores and prevent new comedones; benzoyl peroxide reduces bacteria without causing resistance; azelaic acid calms inflammation and helps dark marks; and salicylic acid can help oily skin. They usually cause some dryness at first and take six to twelve weeks to show their full effect, so changing products every few weeks rarely helps.
For moderate inflammatory acne, a doctor may add a limited course of oral antibiotics or, for women with hormonal patterns, hormonal treatment prescribed with appropriate checks. These need a proper medical history, and we will coordinate with your doctor at home where possible so treatment can continue after your trip.
Isotretinoin (sometimes known by older brand names such as Roaccutane or Accutane) is the most effective treatment for severe, nodular or scarring acne and can give long-lasting clearance. It is also a medicine that needs serious respect. It can cause severe birth defects, so anyone who could become pregnant must use effective contraception from at least a month before starting until at least a month after stopping, with pregnancy testing. It commonly causes dry lips, skin and eyes, and needs blood tests and monitoring; mood changes have been reported, so any low mood should be reported to the prescribing doctor straight away. Isotretinoin is prescribed only after a full consultation, never as a quick fix for a holiday, and many procedures such as strong laser or peels are postponed during and shortly after treatment.
In-clinic acne treatments
Clinic treatments add speed and comfort to the medical plan. Medical extraction removes blackheads, whiteheads and ready pustules under sterile conditions with less trauma than squeezing at home; our article on acne extraction by medical professionals explains why technique matters. For a painful, inflamed nodule before an event, a doctor may sometimes inject a very small dose of diluted corticosteroid to settle it within a day or two, as described in emergency acne injection before a photoshoot. This is used sparingly because it can cause a small dent if overused.
Gentle peels and acne-focused facials help to clear pores and reduce oil; light and laser treatments can calm redness and inflammation; and laser toning such as brightening toning speeds the fading of post-acne marks. LDM or exosome calming care can support irritated skin during treatment. For pores and oil, micro or skin Botox placed in the dermis may reduce oiliness for a few months in selected patients.
For people who want results without visible peeling during a trip, see acne treatment without peeling, and for a summary of devices, the best acne laser near Jongno.
